In the figure below, we find that nearly 60 percent of Republicans believe that illegal immigrants are voting, a claim that has been circulated by Trump in recent days and debunked by political scientists. The share of independents and Democrats who believe non-citizens are voting is considerably lower, but not insignificant.

We also found that 43 percent of Republicans believe people vote under the names of registered voters who have died, and that 36 percent believe that election officials are manipulating vote totals. We did not find very many people who believe double-voting — or someone voting twice — is common.